JOB 1 and JOB 2 are identical processes.
All timers are proposed to be 555/monostable.
JOB 2 will be completed 10 sec after JOB 1.
And then the cycle will be repeated, thus there will be an interval of 10 sec between each job.

Questions:
1) How one timer (Timer A) will trigger the next timer (Timer B)? I mean how will I connect Timer A with Timer B?

2) Studying the flow chart, can somebody guide me if I am correct. And do I need any improvement in the usage of the timers?

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How I read:
Job 1 takes 5 sec; Job2 takes 15 sec ; Jobs follow each other with 10 sec space between each job. Use 4 555's or 2 556's to make a ring counter.
Tie all resets together & gruond at start, then ground first 555 pin 2 to start operation.

Attached Files:

How I read:
Job 1 takes 5 sec; Job2 takes 15 sec ; Jobs follow each other with 10 sec space between each job. Use 4 555's or 2 556's to make a ring counter.
Tie all resets together & gruond at start, then ground first 555 pin 2 to start operation.

Is it correct to say that the start of process B follows the start of process A by 10 sec.? In other words , the processes overlap? ; or is the 10 sec delay at the end of B to the start of AA?

Click to expand...

No. Simply, the duration of each JOB is 20 seconds. JOB2 starts 5 seconds after JOB1 and another 5 seconds delay is forced. JOB1 and JOB2 executes with a gap of 5 + 5 = 10 seconds. As soon as the JOB2 finishes it re-starts JOB1 and the cycle is repeated. Hence, one job is finished 10 seconds after the other.

Attached Files:

I think this fits your nice timing chart: Five 555's only showing triggering. Still need to tie all resets together & connect to +V via 1k. A momentary short of pin 4's to ground will reset all 555's. Heavily loading of outruts may effect operation.

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Looks good. I would raise the start SW 2k resistor to 100k [ 10k to 1M] as there is only a + 33% marginal set pulse for timerA as shown. I would also add 1k resistors between pot and pins 7 to prevent accidental connecting Vcc to pins 7 via pot setting. Looks like all 555s should come up reset on power-up.

POT= potentiometer = variable resistor, or your 1M with arrow pointing at it. My one finger typing tends to make mistakes on long words, so ' tend to avoid them where possible. What are your timing accuracy requirements? Persional openion: 15 sec with 555 good for 1% or better. If far greater accuracy is needed, use a master clock, line frequency [ 50 or 60 Hz divided down to 5 sec] or crystal controlled clock driving a counter like 4017 & using gating to derive time periods. Or use 555 divided down, where a smaller cap with low temperature coeficient can be used.

POT= potentiometer = variable resistor, or your 1M with arrow pointing at it. My one finger typing tends to make mistakes on long words, so ' tend to avoid them where possible. What are your timing accuracy requirements? Persional openion: 15 sec with 555 good for 1% or better. If far greater accuracy is needed, use a master clock, line frequency [ 50 or 60 Hz divided down to 5 sec] or crystal controlled clock driving a counter like 4017 & using gating to derive time periods. Or use 555 divided down, where a smaller cap with low temperature coeficient can be used.

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Thanks for the details. I got it.
The time accuracy is not so important here, 1-5% tolerance will be no problem.